the set up is; s4 turbo on a stock 12, holley 600dp, stock tII down pipe, high flow cat,el cheep oh muffler, 2" pipe from the dp back with a exaust leak after the Dp( its a hole in the pipe about 3/16" at the flange, the carb hat is taped for vac/ boost for the boost gauge and fpr, the vac line for the wg is teed for the bov i removed the boost controler to run stock boost for a test.
i get 2 psi of boost @ 6k. i ran the vac line from the boost gauge to the bov line and no change. i got a new gauge and no change. i changed the turbo and no change.
the gauge reads no vac @ idle if i rev the engine in N. i can get 10 in of vac.

i dont know what to do next. A friend is going to weld the exaust pipe but i dont think that it will fix my problem.

some pics.

 

to me it sounds like a exhaust leak between the block and the turbo , i would check your manifold to block gasket and your turbo to manifold gasket. would also chk wastegate

you got any leaks on the intake between the turbo and the carb

 

i tested the ic and piping from the turbo to the carb hatup to 20 lbs and its good.

i did use used gaskets be tween the block and turbo

i was hoping i would not need to pull the turbo off again but thats what i get for not doing it the first time.

 

The fitting on the front of turbo needs a line run straight to the wastegate. The BOV line needs to be run to the intake. The FPR line needs to be run to the carb hat. You need to have a one way check valve in the vacuum line going to the brake booster. Boost will blow out the diaphram in the booster. If you are running a PCV system, you will also need a one check valve from the the intake to the center iron. From looking at the pics, you need to ditch the smog pump and plug any of the lines comeing off the intake that are associated with the emmisions.

 

possibly too much backpressure in your exhaust system? explain your setup please

do you have an afr guage?

 

Ok. i will do that.

yes i have the check valves installed.

avc is removed and the intake is trimmed and pluged.

the air pump just blowes to the cat so that i can pass the smog test.

 

its a 12a to 13b adaptor for the mani. stock s4 mani.& turbo ( i had a bnr stage 1 on but put the stock turbo on trying to fix the problem) -4 oil feed -10 drain, stock TII DP with precat built in, 2" pipe with a high flow cat and a 2" inlet/outlet chep oh muffler

yes i have a msd wideband; 11.75 @ idle cruse is around 11. and wot is <10

 

clogged cat on the DP, wastegate or BOV could be stuck/sticking open, and/or exhaust leak before turbo are all possibilties. with relatively rich a/f's and using an original 20 year old DP w/ cat, its highly possible that shes clogged by now

 

wastegate, turbo. and bov where all changed and still no boost.

i think i'll "clean out" the DP cat and unbolt the main cat and give it a test run.

 

I would say that it would be a good idea to go with a bigger sized exhaust as well. 2 inch seems a bit on the small side for a turbo setup.

 

ok.. i ran the vac lines as instructed. i gave it a test run with just a "cleaned out Dp" and an 18" long 2" pipe WOW its loud.

And i got boost!! 5psi @5k and 6psi @6k. after work on tues. ill bolt the exaust back on and install the boost controller for a test.

THANK YOU... and good call on the pre cat.

 

no prob ive seen too many clogged cats cause all sorts of troubles in my line of work, and honestly, who needs them anyway . glad to hear shes running good now

 

Good deal. Just make sure that you have reseached on how to properly boost prep a Holley. There are alot of little issues that you can run into with the Holley carbs. You never stated whether or not you had a AFR gauge. I hope your using a wideband.

 

ok.. i put the exaust back on and nothing

i should be getting a 3" turbo back put on in a week or two.

yes i have don a lot of reseach on how to boost prep a Holley. once i'm getting boost i can start leaning out the carb to get a good afr.

 

You will feel the 3" exhaust I'm maxing out my stock s5 turbo! 270BHP and 2575lb 82 gen1 rx-7. I couldn't believe how much difference cold air to the air filter, an intercooler and a 3" did. Dial in 13psi and you have an absolute wall of power from 4000rpm to 6500rpm

http://www.youtube.com/watch?v=P12jwypWL5U

PB the run before snapping/twisting axles was 13.362@103 on a messy run. Best MPH is 109. This car is 12sec capable easy. PS I haven't gotten a clean run from the car without problems yet. The 13.362 was with a few problems such as the throttle pulley slipping LOL

 

i did the same . just smoked my buddies 5 . 0 //holy hell/// no cat . no silincer

 

Looks like you finally got your car running. Any updates?

 

prowling in the 1st gen section? I knew you were a secret 1st gen fan. JK Sorry for thread jack.

is there a place to learn about boost prepping a nikki carb? I wanna go turbo so barney stops making fun of my car.

 

Also wat kind of one way check valve should be used? N is there diff. Kinds?

 

pm u jinx ,dont want to make u mad in front of people

 

well... 3" exaust and wow....boost is good im fixing the leak at the mani now and then i can get it tuned. with the new job i just have not had time to work on it in a few weeks. but soon. and ill update when its running.